Antislipping stud.



T, SLOPER. ANTISLIPPING' STUD. APPLICATION I'ILED APR.25, 1910.

1,009, 1 9'1. Patented Nov. 21, 1911.

'tlNlTE FFTQ THOMAS SLOPER, OF DEVIZES, ENGLAND.

ANTISLIPPING STUD.

Specification of Letters Patent.

Patented Nov. 21, 1911.

Application filed April 25, 1910. Serial No. 557,521.

To all whom it may concern:

Be it known that I, Tnioims Snornn, a subject of the King of England,residing at Devizes, in the county of Wilts, England, have inventedcertain new and useful Improvements in Antislipping Studs, of which thefollowing is a specification.

This invention is for improvements in or relating to non-slippingsurfaces for elastic tires and other elastic goods and has for itsobject to provide a composite stud or block which may be more durablethan those here tofore produced.

It is well known that studs for tires are liable to wear rapidly and ifmade of steel and hardened, they are liable to break. To overcome theseditficulties composite studs have been introduced, that is studs whosehead and body port-ions are made of separate pieces secured togetherduring manufacture. Preferably the head of each stud is of hardenedmaterial and the body portion of soft material, so that the part of thefinished stud exposed to wear, namely the head, is hard, while that partthat carries the head is softer and does not so readily fracture. Insome cases, however, it may be preferred to make both the head and bodyportions of hard or comparatively hard material.

According to this invention the body portion of the composite studcomprises two perforated disks that preferably take the form. of annularor washer-like parts that are connected face to face by distance pieces.Preferably the washer-like parts and distance pieces are all integral.The body portions may be stamped or otherwise formed and if stamped itis sometimes preferred to form one at least of the disks or washer-likeparts of a number of segments that are arranged around a given center,the segments being in contact with each other or slightly separated asfound convenient. It will be seen that this ,still constitutes awasher-like part although instead of being continuous it is interrupted.

In the accompanying drawings which illustrate one method of carrying outthis invention, Figure 1 is a plan of a body por tion of the studillustrating different steps in the manufacture of one form of studaccording to this invention, Fig. 2 is an underside view of the studshown in Fig. 1 completed, Fig. 3 shows the body portion of yet anotherform of stud according to this invention and illustrates different stepsin the process of making it up, Fig. 4c is an underside view of the studshown in Fig. 3 completed, and 5 is a side elevation of the samecompleted stud.

Like letters indicate like parts through.- out the accompanyingdrawings.

Referring to the drawings and particularly to Fig. 5, it will be seenthat the completed stud comprises an annular disk from which radiate aplurality of arms that are bent to provide a second, interrupted, orbroken disk, and a head portion secured to one of said disks. The twodisk-like sections of the stud being connected by separated spacing ordistance pieces and being of the form shown, it will be seen that whenthe device is embedded in rubber the latter is permitted to freely enterthe spaces and after vulcanization the stud is securely locked in place.The construction is one that affords considerable strength as thewasherlike parts and distance pieces forming the body are all integraland the l1ardened head is firmly secured to the body art.

The body portion is stamped from a metal sheet in the form of a washer Ghaving radiating from it the distance pieces G and segments G on theends of the distance pieces. The segments G are so shaped that when thedistance pieces G are bent upright to the washer G and the segments bentover parallel to the washer as shown in Fig. 2, they constitute thesecond or lower washerlike portion, this being further interruptedinstead of continuous as before. The head H is secured in thewasher-like portion G by doming the washer and forcing the metal into agroove in the head. In Fig. 1 two of the segments G are shown bent overinto place while two others are bent at right angles to the distancepieces G but the latter are not bent up into position relatively to thepart G and two other distance pieces with their segments are shown inthe flat.

It will be seen that in the construction of stud shown in Figs. 1 and 2the distance pieces are connected to the outer circumference of the twodisks or washer-like parts in Figs. 3 to 5 a form of stud is shown madeup in the same manner as that illustrated in Figs. 1 and 2, but thedistance pieces J are connected to the outer edge of the disk orwasher-like part J and to the inner edge of the disk or Washer-like partformed by the segments J To effect this the distance pieces J instead ofbeing upright to the washer J are bent inwardly toward the center of thewasher and the segments J are turned outwardly as is clearly shown inthe drawings. It will be understood that the various methods of stampingup or drawing the body portions of the studs are only given by way ofexample as many different methods may obviously be adopted.

In all the constructions described the body of each stud is preferablymade of soft steel and by its construction obtains a. good anchorage inthe rubber in which it is embedded while the head being preferably ofhardened steel is durable. Nevertheless the body part can be made ofhard metal, but the above described construction is preferred.

Vhat I claim as my invention and desire to secure by Letters Patentis 1. The herein described anti-slipping stud, comprising an annulardisk, a plurality of arms radiating from said disk and bent to provide asecond, interrupted disk and spacing or distance pieces between saiddisks, and a head portion secured to one of said disks.

2. The herein described anti-slipping stud, comprising a perforatedsheet metal disk having a plurality of integral radiating arms bent toprovide a second disk out of contact with said first disk, and aseparate head portion secured to one of said disks.

3. The herein described anti-slipping stud, comprismg a perforated sheetmetal THOMAS SLOPER. lVitnesses H. D. JAMESON, CARL R. LooP.

Copies of this patent may be obtained' for five cents each, byaddressing the Commissioner of Patents, Washington, D. G.

